Overflow ne marche pas pour le tableau

Bonjour,

J'ai une incompatibilité avec IE7. Sur Firefox avec firebug on peut voir l'élément <table border="0" width="100%"> déborde en terme de hauteur.
Le code est joint en bas. Toute suggestion est la bienvenue.
Code:
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<html>
<head>
</head>
<body>
<div id="popcontact" style="position: absolute; width: 400px; height: 100px; top: 67px; left: 296px; background-color: white; border: 1px solid black; z-index: 17780;">
<div style="height:100%; width:100%; overflow-x:hidden; overflow-y:auto;" id="divInput">
<table border="0" width="100%">
<tbody width="100%">
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_78" name="chk_zus_1_78">&nbsp;<label for="chk_zus_1_78"><b></b> Login (prenom nom)<span id="zus_78"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_334" name="chk_zus_1_334">&nbsp;<label for="chk_zus_1_334"><b></b> Login (prenom nom)<span id="zus_334"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_79" name="chk_zus_1_79">&nbsp;<label for="chk_zus_1_79"><b></b> Login (prenom nom)<span id="zus_79"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_335" name="chk_zus_1_335">&nbsp;<label for="chk_zus_1_335"><b></b> Login (prenom nom)<span id="zus_335"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_80" name="chk_zus_1_80">&nbsp;<label for="chk_zus_1_80"><b></b> Login (prenom nom)<span id="zus_80"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_336" name="chk_zus_1_336">&nbsp;<label for="chk_zus_1_336"><b></b> Login (prenom nom)<span id="zus_336"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_81" name="chk_zus_1_81">&nbsp;<label for="chk_zus_1_81"><b></b> Login (prenom nom)<span id="zus_81"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_337" name="chk_zus_1_337">&nbsp;<label for="chk_zus_1_337"><b></b> Login (prenom nom)<span id="zus_337"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_82" name="chk_zus_1_82">&nbsp;<label for="chk_zus_1_82"><b></b> Login (prenom nom)<span id="zus_82"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_338" name="chk_zus_1_338">&nbsp;<label for="chk_zus_1_338"><b></b> Login (prenom nom)<span id="zus_338"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_83" name="chk_zus_1_83">&nbsp;<label for="chk_zus_1_83"><b></b> Login (prenom nom)<span id="zus_83"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_339" name="chk_zus_1_339">&nbsp;<label for="chk_zus_1_339"><b></b> Login (prenom nom)<span id="zus_339"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_84" name="chk_zus_1_84">&nbsp;<label for="chk_zus_1_84"><b></b> Login (prenom nom)<span id="zus_84"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_340" name="chk_zus_1_340">&nbsp;<label for="chk_zus_1_340"><b></b> Login (prenom nom)<span id="zus_340"></span></label></a></td>
<td></td></tr>
<tr>
<td><a style="color:black" ><input type="checkbox"  id="chk_zus_1_85" name="chk_zus_1_85">&nbsp;<label for="chk_zus_1_85"><b></b> Login (prenom nom)<span id="zus_85"></span></label></a></td>
<td></td></tr>
</tbody>
</table>
</div>
</div>
</body>
</html>
Merci